What's the consensus best gun or setup? Feels like alot more ways to do things in this game(only played MW2, MW3). Right now I have a shotgun as my secondary weapon like in modern warfare 2. Like 3 attachments on my primary gun, 2 on my secondary so don't have a single tactical, lethal, perks etc. with my class. Dunno if that's an overkill, no big deal er what.